In "An Occurrence at Owl Creek Bridge," how does the sensation that Farquhar experiences "with terrible suddenness" relate to the theme of the story?

The quote you have
indicated comes in the third section of the story, which is when, following the initial
introduction of the first section and the flashback of the second section, Farquhar is finally
pushed off the bridge and left to hang. Note the quote that describes the sensation that he
experiences as he falls and then feels the pressure on his...